Which is best practice or format? Does the script have to be all on one line or can it be on many separate lines like this?

document.write("Today's date is " 
return+  (RightNow.getMonth()+1)+ 
return"-" + RightNow.getDate() + "-" 
return+ RightNow.getFullYear() + ".  
returnYou entered this Web Page at exactly: " 
return+ RightNow.getHours() +
return":" + RightNow.getMinutes()  + " and " 
return+ RightNow.getSeconds() +
return" seconds")